I see what you are saying about an oversea market sustaining a particular brand/property once it's got it's footing however I was distinctly talking about crazes in the other sense. That is the craze of 'westerns' for example. If two studios made some kick ass western with huge hollywood stars reaching into the billions with grosses. The other studios, as they often do, would find a way to jump into that, for this is a business as one wouldn't expect touch screens to stay exclusive to one company when that much money is up for grabs.
So we then have a Western craze, not so similar to that of the secure superhero craze/trend we are in right now. It would pass and we'd move into the next one. However whilst we are in that craze the studio that is complacent with their supremacy(if you will) will talk our ears off with all their spin off and tie in plans and we'll lap it up cause it's all so hot and interesting within that craze that it's bound to be relevant and successful. Now that same sort of talk outside of the craze and well...you need the stars back and main properties.
What you are talking about is something like pirates or TF into themselves as brands now being secure and sustained overseas(though I'd argue TF is plenty sustained here with it's new star). I think a hand full of marvel properties might reach this, though I doubt they will if they keep landing sub 700mill unlike TF/Pirates did out the jump, but I don't think the whole machination of kevin feige will. Him talking about plans for black widow and doctor strange get alot of trade action in this current world. Tens years ago, no 20 years into the future maybe. Though talk of a new batman/superman/spiderman would land hard always...imo
As for which properties themselves will keep on keeping on, I suppose you raise an interesting point. Perhaps some of these marvel ones have touched enough hearts internationally to which one can surmise they will always be viable. Maybe, though I personally don't see pirates lasting without Depp, not the way Bats/Supes(and Spidey) can and have been relevant for over 50 years regardless of actors. Again, we'll see how it goes post RDJ...